merger is consummated. There are few consistent explanations, however, as to why so many mergers result in such poor … and R&D intensity) have on post-merger abnormal returns. The paper also attempts to assess how differences in valuation … that firm value is positively impacted in the first one to three years post merger by acquiring related assets, but that …

change in market concentration and Research and Development is positively correlated to the merger deal premium in a … horizontal merger. Furthermore, deal premiums tend to follow an inverted U curve pattern relative to market concentration change …

have challenged efficiency-enhancing mergers as evidenced by the pattern of abnormal returns to rivals during merger events … pattern of abnormal returns is a result of the different effects that antitrust complaints and merger outcomes have on rivals …